Description
This ST X coilover suspension package refines ride quality and handling for everyday drivers who want improved cornering without sacrificing comfort. Engineered for BMW platforms including the 428i convertible, the kit provides wide height adjustability, corrosion-resistant hardware, and a dust protection system to preserve the hardened chrome piston rod and internal valve packs. ST relies on KW-developed dampers to deliver consistent, tuned damping while composite spring perches with stainless steel inserts prevent corrosion between strut and perch — making this a durable, direct-fit coilover solution for street-driven performance upgrades.
Features:
- Adjustable spring perch with stainless steel insert
- Galvanized zinc coated steel struts
- Height adjustability for ride height tuning
- Dust protection system for piston rod
- Multi-layer pressure resistant sealing package
- Mono block guide system for stable damping
- Low friction piston band inside damper housing
- KW-engineered damper technology for road comfort
- Application specific fitment for direct fit installation
Vehicle Fitment:
- 2014–2018 BMW 320i Base
- 2014–2018 BMW 328d Base
- 2018 BMW 328d xDrive Base
- 2014–2016 BMW 328i Base
- 2016,2018 BMW 330e Base
- 2017 BMW 330e iPerformance
- 2017–2018 BMW 330i Base
- 2014–2015 BMW 335i Base
- 2016–2018 BMW 340i Base
- 2014–2016 BMW 428i Base
- 2015–2016 BMW 428i Gran Coupe Base
- 2017–2020 BMW 430i Base
- 2017–2020 BMW 430i Gran Coupe Base
- 2014–2016 BMW 435i Base
- 2015–2016 BMW 435i Gran Coupe Base
- 2017–2020 BMW 440i Base
- 2017–2020 BMW 440i Gran Coupe Base
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